Nonlinear backstepping controller design for bridge-type fault current limiter to enhance the transient performance of hybrid power systems

Md Rashidul Islam*, Arghya Das Upadhay, Tushar Kanti Roy, Jakir Hasan, Md Apel Mahmud

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A nonlinear backstepping control scheme is proposed in this work for a bridge type fault current limiter (BFCL) in a hybrid power system for enhancing its transient performance. The hybrid power system has the provision to supply AC loads connected to the main grid and local DC loads. The DC-side of that system is coupled with AC-side through a bidirectional converter having power exchange capability between both AC- and DC-sides. The AC-side is coupled with the main grid through transmission lines and the BFCL is placed on the transmission line, where the faults are considered, as the transmission line is the most vulnerable point. The dynamical model of the BFCL is used to design the nonlinear backstepping controller (BSC) where the control input is derived in a way that it can ensure as well as enhance the transient performance of that hybrid power system. Lyapunov stability theory is used to theoretically demonstrate the stability of the BFCL using the proposed BSC. Theoretical findings guarantee the system stability, and simulation studies clearly indicate the superiority of the proposed BSC based BFCL (BSC-BFCL), both graphically and numerically over an existing nonlinear sliding mode controller (SMC) for the BFCL (SMC-BFCL), for symmetrical and unsymmetrical fault scenarios (both temporary and permanent type). In addition, percentage overshoot and settling time analyses suggest the lesser deviation of system responses during transients from their ideal values and quicker stability, respectively. Moreover, the astonishing total harmonic distortion (THD) values with the proposed technique signify the excellency over its competitors in every aspect.

Original languageEnglish
Article numbere13097
Number of pages17
JournalInternational Transactions on Electrical Energy Systems
Volume31
Issue number11
Early online date12 Sep 2021
DOIs
Publication statusPublished - 1 Nov 2021
Externally publishedYes

Fingerprint

Dive into the research topics of 'Nonlinear backstepping controller design for bridge-type fault current limiter to enhance the transient performance of hybrid power systems'. Together they form a unique fingerprint.

Cite this